/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include <stdio.h>

#include <string.h>

#include "jvmti.h"

#ifdef __cplusplus

extern "C" {

#endif

#ifndef JNI_ENV_ARG

#ifdef __cplusplus

#define JNI_ENV_ARG(x, y) y

#define JNI_ENV_PTR(x) x

#else

#define JNI_ENV_ARG(x,y) x, y

#define JNI_ENV_PTR(x) (*x)

#endif

#endif

#define TranslateError(err) "JVMTI error"

#define PASSED 0

#define FAILED 2

static const char *EXC_CNAME = "java/lang/Exception";

static jvmtiEnv *jvmti = NULL;

static jint result = PASSED;

static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);

JNIEXPORT

jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT

jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT

jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {

    return JNI_VERSION_1_8;

}

static

jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {

    jint res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),

                                        JVMTI_VERSION_9);

    if (res != JNI_OK || jvmti == NULL) {

        printf("    Error: wrong result of a valid call to GetEnv!\n");

        return JNI_ERR;

    }

    return JNI_OK;

}

static

void throw_exc(JNIEnv *env, char *msg) {

    jclass exc_class = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, EXC_CNAME));

    jint rt = JNI_OK;

    if (exc_class == NULL) {

        printf("throw_exc: Error in FindClass(env, %s)\n", EXC_CNAME);

        return;

    }

    rt = JNI_ENV_PTR(env)->ThrowNew(JNI_ENV_ARG(env, exc_class), msg);

    if (rt == JNI_ERR) {

        printf("throw_exc: Error in JNI ThrowNew(env, %s)\n", msg);

    }

}

static

    jclass cls = NULL;

    cls = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, MOD_CNAME));

    if (cls == NULL) {

        printf("    Error in JNI FindClass: %s\n", MOD_CNAME);

    }

    return cls;

}

jmethodID

get_method(JNIEnv *env, jclass clazz, const char * name, const char *sig) {

    jmethodID method = NULL;

    method = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, clazz), name, sig);

    if (method == NULL) {

        printf("    Error in JNI GetMethodID %s with signature %s", name, sig);

    }

    return method;

}

static

jboolean is_exported(JNIEnv *env, jobject module, const char* pkg, jboolean open) {

    static jmethodID mIsExported = NULL;

    jstring jstr = NULL;

    jboolean res = JNI_FALSE;

    if (mIsExported == NULL) {

        const char* sign = "(Ljava/lang/String;)Z";

        const char* name = open ? "isOpen" : "isExported";

    }

    jstr = JNI_ENV_PTR(env)->NewStringUTF(JNI_ENV_ARG(env, pkg));

    res = JNI_ENV_PTR(env)->CallBooleanMethod(JNI_ENV_ARG(env, module),

                                              mIsExported, jstr);

    return res;

}

static

jboolean is_exported_to(JNIEnv *env, jobject module, const char* pkg, jobject to_module,

                        jboolean open) {

    static jmethodID mIsExportedTo = NULL;

    jstring jstr = NULL;

    jboolean res = JNI_FALSE;

    if (mIsExportedTo == NULL) {

        const char* name = open ? "isOpen" : "isExported";

    }

    jstr = JNI_ENV_PTR(env)->NewStringUTF(JNI_ENV_ARG(env, pkg));

    res = JNI_ENV_PTR(env)->CallBooleanMethod(JNI_ENV_ARG(env, module),

                                              mIsExportedTo, jstr, to_module);

    return res;

}

static

jvmtiError add_module_exports(jobject baseModule, const char* pkg, jobject thisModule,

                              jboolean open) {

    jvmtiError err = JVMTI_ERROR_NONE;

    if (open) {

        err = (*jvmti)->AddModuleOpens(jvmti, baseModule, pkg, thisModule);

    } else {

        err = (*jvmti)->AddModuleExports(jvmti, baseModule, pkg, thisModule);

    }

    return err;

}

static

jint check_add_module_exports(JNIEnv *env,

                              jclass  cls,

                              jobject baseModule,

                              jobject thisModule,

                              jboolean open) {

    static char strbuf[128] = { '\0' };

    jvmtiError err = JVMTI_ERROR_NONE;

    const char* pkg = open ? "jdk.internal.math"

                           : "jdk.internal.misc";

    const char* bad_pkg = "my.bad.pkg";

    const char* jvmti_fn = open ? "AddModuleOpens"

                                : "AddModuleExports";

    jboolean exported = JNI_FALSE;

    // Export from NULL module

    printf("Check #N1:\n");

    err = add_module_exports(NULL, pkg, thisModule, open);

    if (err != JVMTI_ERROR_NULL_POINTER) {

        printf("#N1: jvmtiError from %s: %d\n", jvmti_fn, err);

        throw_exc(env, "Check #N1: failed to return JVMTI_ERROR_NULL_POINTER for module==NULL");

        return FAILED;

    }

    // Export NULL package

    printf("Check #N2:\n");

    err = add_module_exports(baseModule, NULL, thisModule, open);

    if (err != JVMTI_ERROR_NULL_POINTER) {

        printf("#N2: jvmtiError from %s: %d\n", jvmti_fn, err);

        throw_exc(env, "Check #N2: failed to return JVMTI_ERROR_NULL_POINTER for pkg==NULL");

        return FAILED;

    }

    // Export to NULL module

    printf("Check #N3:\n");

    err = add_module_exports(baseModule, pkg, NULL, open);

    if (err != JVMTI_ERROR_NULL_POINTER) {

        printf("#N3: jvmtiError from %s: %d\n", jvmti_fn, err);

        throw_exc(env, "Check #N3: failed to return JVMTI_ERROR_NULL_POINTER for to_module==NULL");

        return FAILED;

    }

    // Export a bad package

    printf("Check #I0:\n");

    err = add_module_exports(baseModule, bad_pkg, thisModule, open);

    if (err != JVMTI_ERROR_ILLEGAL_ARGUMENT) {

        printf("#I0: jvmtiError from %s: %d\n", jvmti_fn, err);

        throw_exc(env, "Check #I0: did not get expected JVMTI_ERROR_ILLEGAL_ARGUMENT for invalid package");

        return FAILED;

    }

    // Export from invalid module (cls)

    printf("Check #I1:\n");

    err = add_module_exports((jobject)cls, pkg, thisModule, open);

    if (err != JVMTI_ERROR_INVALID_MODULE) {

        printf("#I1: jvmtiError from %s: %d\n", jvmti_fn, err);

        throw_exc(env, "Check #I1: did not get expected JVMTI_ERROR_INVALID_MODULE for invalid module");

        return FAILED;

    }

    // Export to invalid module (cls)

    printf("Check #I2:\n");

    err = add_module_exports(baseModule, pkg, (jobject)cls, open);

    if (err != JVMTI_ERROR_INVALID_MODULE) {

        printf("#I2: jvmtiError from %s: %d\n", jvmti_fn, err);

        throw_exc(env, "Check #I2: did not get expected JVMTI_ERROR_INVALID_MODULE for invalid to_module");

        return FAILED;

    }

    // Check the pkg is not exported from baseModule to thisModule

    printf("Check #C0:\n");

    exported = is_exported_to(env, baseModule, pkg, thisModule, open);

    if (exported != JNI_FALSE) {

        sprintf(strbuf, "Check #C0: unexpected export of %s from base to this", pkg);

        throw_exc(env, strbuf);

        return FAILED;

    }

    // Add export of the pkg from baseModule to thisModule

    printf("Check #C1:\n");

    err = add_module_exports(baseModule, pkg, thisModule, open);

    if (err != JVMTI_ERROR_NONE) {

        printf("#C1: jvmtiError from %s: %d\n", jvmti_fn, err);

        sprintf(strbuf, "Check #C1: error in add export of %s from base to this", pkg);

        throw_exc(env, strbuf);

        return FAILED;

    }

    // Check the pkg is exported from baseModule to thisModule

    printf("Check #C2:\n");

    exported = is_exported_to(env, baseModule, pkg, thisModule, open);

    if (exported == JNI_FALSE) {

        sprintf(strbuf, "Check #C2: failed to export %s from base to this", pkg);

        throw_exc(env, strbuf);

        return FAILED;

    }

    // Check the pkg is not exported to all modules

    printf("Check #C3:\n");

    exported = is_exported(env, baseModule, pkg, open);

    if (exported != JNI_FALSE) {

        sprintf(strbuf, "Check #C3: unexpected export of %s from base to all modules", pkg);

        throw_exc(env, strbuf);

        return FAILED;

    }

    return PASSED;

}

JNIEXPORT jint JNICALL

Java_MyPackage_AddModuleExportsAndOpensTest_check(JNIEnv *env,

                                                  jclass cls,

                                                  jobject baseModule,

                                                  jobject thisModule) {

    if (jvmti == NULL) {

        throw_exc(env, "JVMTI client was not properly loaded!\n");

        return FAILED;

    }

    printf("\n*** Checks for JVMTI AddModuleExports ***\n\n");

    result = check_add_module_exports(env, cls, baseModule, thisModule, JNI_FALSE);

    if (result != PASSED) {

        return result;

    }

    printf("\n*** Checks for JVMTI AddModuleOpens ***\n\n");

    result = check_add_module_exports(env, cls, baseModule, thisModule, JNI_TRUE);

    if (result != PASSED) {

        return result;

    }

    return result;

}

#ifdef __cplusplus

}

#endif